Configurable wifi channel

src/freedombone-config

   #fi
 
   if [[ $SYSTEM_TYPE == "$VARIANT_MESH_USER" ]]; then
-      freedombone-client --essid $ESSID
+      freedombone-client --essid $ESSID --channel $WIFI_CHANNEL
       if [ "$?" = "0" ]; then
           clear
           echo ".---.                  .              .                   "